Lots of non-existant networks
Abha Ahuja
ahuja at merit.edu
Thu Jun 26 18:14:54 UTC 1997
Hi!
We started tracking this kind of information too... Check out:
http://www.rsng.net/pair/
We're hoping that these tools make it easier for the community to
diagnose and troubleshoot these types of routing and policy problems.
Let us know what you think of them...
-abha ;)
On Thu, 26 Jun 1997, Curtis Villamizar wrote:
>
> In message <Pine.SOL.3.95.970618151012.15875A-100000 at roofdog.acsi.net>, "Eric D
> . Madison" writes:
> > There still seems to be a lot of Routes out there that are not in the
> > RADB. I know that ANS is not excepting routes not in a routing database,
> > and others are starting to follow. It's a good idea!
> >
> > I am not getting some of these routes because of the lack of an RADB
> > entry, and it's very frustrating..
> >
> > Anyone else having the same problems??
> >
> > Ohh one more thing.. Seems that there are also some routes that are being
> > advertised that don't even have a InterNIC/RIPE/APNIC entry either..
> > If they don't have an entry, then they are not real "Valid" routes, so I
> > don't want to route them.. but the Origin is from a large
> > provider.. any suggestions? Seems that they have build their whole
> > infrastructure on these routes too.
> >
> > Eric
> >
> > _______________________________________________________
> > Eric D. Madison - Senior Network Engineer -
> > ACSI - Advanced Data Services - ATM/IP Backbone Group
> > 24 Hour NMC/NOC (800)291-7889 Email: noc at acsi.net
>
>
> The route-dumps anaylsys page has been updated. It provides quite a
> bit more detail, some ANS specific (sorry). The URL is:
>
> http://engr.ans.net/route-dumps/
>
> New stuff on this page are:
>
> Listing by border AS - so we know who we can bug if a reachability
> problem is reported and we know how much will be missing due to
> filtering on a per border AS basis. It also helps us concentrate on
> routes passed to us by our direct customers. This would be useful
> to others if they peer with some of the same border AS.
>
> Reports now include (as of the most recent one):
>
> 2477 unregistered prefixes
> 240 prefixes unreachable due to incorrect origin AS
> 2 prefixes with no ANS policy
> 15 prefixes with incorrect ANS policy
>
> 2074 prefixes registered with incorrect origin AS (a warning)
>
> Each problem category is also sorted by border AS and origin AS
>
> Pages are available which report on only a specific border AS and/or
> origin AS. These are useful to anyone wanting to clean up their own
> AS, since the observed paths for each prefix is provided.
>
> Information is available down to the prefix, with observed AS paths
> reported, as well as the [sort of encrypted - consider it a bug] ANS
> policy in cases where ANS policy is thought to be the problem.
>
> Of the 22 border AS with any unregistered prefixes (46 with some sort
> of problem or warning), the worst offenders are the border AS with
> over 90 unregistered prefixes:
>
> AS174 (149),
> AS286 (94),
> AS568 (166),
> AS701 (550),
> AS1239 (1131),
> AS1800 (443).
>
> There are 398 origin AS with unregistered prefixes, most with just a
> few.
>
> Curtis
>
> btw- the "15 prefixes with incorrect ANS policy" both seem to be due
> to a transient where we intentionally do not accept a backup route
> from the CIX for certain providers we directly peer with yet the CIX
> was announcing one. The "2 prefixes with no ANS policy" are one
> prefix origin AS and we addressed this after the report.
>
__________________________________________________________________________
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abha ahuja ahuja at merit.edu
Merit Network, Inc.
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